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We eat food composed of all the nutrients like carbohydrates, proteins, fats, vitamins, minerals and water. After digestion, these are absorbed in the form of glucose, amino acids, fatty acids, glycerol etc. What mechanisms are involved in absorption of digested food and water?
 
a. The __________ process involves moving molecules from a higher concentration to a lower concentration.
 
b. In the _______ process, water molecules pass through a semipermeable membrane as they move from a lower solute concentration to a higher solute concentration. While water is absorbed through the process of osmosis, digested food enters the blood vessels through ________.